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S41936-019-0080-8.Pdf Gosavi et al. The Journal of Basic and Applied Zoology (2019) 80:9 The Journal of Basic https://doi.org/10.1186/s41936-019-0080-8 and Applied Zoology RESEARCH Open Access Assessing the sustainability of lepidophagous catfish, Pachypterus khavalchor (Kulkarni, 1952), from a tropical river Panchaganga, Maharashtra, India Sachin M. Gosavi1,2,3*† , Sanjay S. Kharat1†, Pradeep Kumkar1 and Sandip D. Tapkir1,4 Abstract Background: The Western Ghats of India, one of the global biodiversity hotspots and freshwater eco-regions, harbors several fish species which not just form the important part of the world’s freshwater biodiversity yet in addition are the vital segment of livelihood of the neighborhood population. The rate of fish decline in the Western Ghats is alarming. The absence of organized study and data scarcity on basic biology and life history traits of several species could be one reason behind the decline, and thus it is difficult to execute conservation action/s. This is especially true, particularly for data-deficient species for which definite data related to distribution, population size, and trend is not available. The present study deals with the detailed investigation of population dynamics of catfish species, Pachypterus khavalchor, which is data-deficient species inhabiting the Western Ghats of India and forms an important component of freshwater inland fishery, providing nutritional and financial security to the local community. Methods: Specimens for the present study were collected monthly for a period of 1 year from the River Panchaganga and length–frequency data were analyzed using FiSAT II software. Results: Length–weight analysis of pooled (male + female) data suggested the fish exhibited higher exponent than expected under isometry, indicating the positive allometric growth of P. khavalchor in the Panchaganga River. The asymptotic length (L∞)andthegrowthrate(K) were estimated as 149.63 mm and 0.71 year−1 respectively. Potential longevity (tmax) and length at first capture (Lc) were estimated as 4.22 years and 73 mm respectively. The total (Z), natural (M), and fishing mortality (F) were estimated as 2.23 year−1,0.88year−1,and −1 1.35 year respectively. The current exploitation rate (Ecur = 0.60) was found to be almost 90% that gives the maximum relative yield per recruit (Emax = 0.67). Recruitment pattern revealed two peaks, suggesting the fish have two spawning bouts each year. Conclusions: The stock of P. khavalchor in the Panchaganga River may be in near full exploitation under the current harvesting strategy, with a high chance of recruitment failure in the future. Additional studies on the reproductive biology of P. khavalchor would be particularly welcome for the imposition of the seasonal closure for effective conservation of stock. Keywords: Lepidophagy, Fishery, Data scarcity, Freshwater ecosystem, Recruitment, Aquatic conservation, Mortality * Correspondence: [email protected] †Sachin M. Gosavi and Sanjay S. Kharat contributed equally to this work. 1Department of Zoology, Modern College of Arts, Science and Commerce, Ganeshkhind, Pune, Maharashtra 411 016, India 2Post Graduate Research Centre, Department of Zoology, Modern College of Arts, Science and Commerce, Shivajinagar, Pune, Maharashtra 411 005, India Full list of author information is available at the end of the article © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Gosavi et al. The Journal of Basic and Applied Zoology (2019) 80:9 Page 2 of 10 Background 2012; Eschmeyer et al., 2018). Each of these species is ex- The Western Ghats of India is well known for its exclusive tremely delicious and having good market demands in their biodiversity and also classified as a freshwater eco-region distribution range and thus provides dietary and financial with more than 300 species of the freshwater fishes (Abell advantage to the local community (Buragohain, 2018; et al., 2008;Molur,Smith,Daniel,&Darwall,2011;Myers, Gosavi,Kharat,Kumkar,&Navarange,2018;Kumbar& Mittermeier, Mittermeier, Da Fonseca, & Kent, 2000). Lad, 2014). Since Pachypterus species forms an important Nearly 30% of the species inhabiting the Western Ghats part of the open-access fisheries, they are getting exploited have been categorized as threatened in the IUCN Red list in their distribution range leading to a huge decline in (Dahanukar, 2011; Dahanukar, Raghavan, Ali, Abraham, & population (Buragohain, 2018;Kumbar&Lad,2014). In Shaji, 2011; , Ramprasanth, Ali, & Dahanukar, 2018a). support to this, Dahanukar (2011) and Menon (1999) However, several endemic and threatened species con- already pointed that several anthropogenic activities such tinue to be harvested at unsustainable levels through arti- as urbanization, industrial developments, and mining are sanal and open-access fisheries throughout the Western contributing to dwindling population of P. khavalchor. Ghats (Das et al., 2017; Keskar, Raghavan, Kumkar, Menon (2004)andMoluretal.(2011) further suggested Padhye, & Dahanukar, 2017; Kharat & Dahanukar, 2013; that it could be a threatened species due to its fragmented Prasad, Ali, Harikrishnan, & Raghavan, 2012; Raghavan, population and non-availability of population data. As a Ali, Dahanukar, & Rosser, 2011; Raghavan et al., 2018a). result, presently, P. khavalchor is categorized as the “data According to Darwall et al. (2018), another most import- deficient” species by IUCN (Dahanukar, 2011; Dahanukar ant and fundamental cause for the freshwater biodiversity et al., 2012;IUCN,2018). However, despite of the variety of crisis is the insufficient consideration of impacts on fresh- threats operating on the P. khavalchor presently, no conser- water ecosystems in decision-making and policy. However, vation action plans are specifically directed towards conser- decision-making and policy establishment require the reli- vation of this species. As a result of combined threats from able data on the population dynamics/trend, and thus the different sources, data deficiency, and suggested possibility information inadequacy on population dynamics for ma- of the loss of this freshwater catfish species by (Menon, jority of endemic species hindered the development of ap- 1999), it is an immediate need to generate the data on the propriate conservation action plans (Cooke, Paukert, & life history traits of P. khavalchor for instantaneous con- Hogan, 2012; Dahanukar et al., 2011; Luiz, Woods, Madin, servation action. &Madin,2016;Moraisetal.,2013). At present, the West- The persistence of any fish species in the given habitat ern Ghats of India harbor 26 data-deficient species and is dependent on the life history traits of that species majority of them are likely to be threatened with extinc- (Das et al., 2017, 2018; Kumar et al., 2014; Prasad et al., tion (Dahanukar et al., 2011; Molur et al., 2011). Because 2012; Raghavan et al., 2011, 2018a). Under the present of lack of substantial information on population dynamics, environmental conditions, life history traits must gener- the data-deficient species are not at the forefront of the ate sufficient recruitment for a given population to per- conservation agenda (Luiz et al., 2016;Moraisetal.,2013; sist. In this context, considerable knowledge on length– Possingham et al., 2002). As data deficiency not only means weight relationships, growth, population structure, mor- the absence of records, but it may indicate dangerously low tality (natural and fishing), exploitation level, and re- abundance, Mace et al. (2008) clearly stated that “data-defi- cruitment pattern of an exploited stock is essential for cient species should be afforded the same degree of protec- planning and management of fisheries resources, mainly tion as a threatened species until more information is when the species form the important component of the forthcoming.” Keeping the above thought in view, it is fun- artisanal fisheries and lies at the base of the higher food damentally critical to have data on population biology pa- web (Das et al., 2017, 2018; Kumar et al., 2014). There- rameters of known data-deficient species inhabiting the fore, present investigation was carried out for the assess- Western Ghats of India for their effective conservation and ment and evaluation of various life history traits of P. management. khavalchor using length–frequency data collected for The catfish genus Pachypterus consists of three species one year. This study generates first of its kind informa- viz. Pachypterus acutirostris (Day, 1870) distributed in tion on the life history traits and population dynamics of Irrawaddy, Sittang, and Bago rivers, Myanmar (Eschmeyer, the genus Pachypterus in general and P. khavalchor in Fricke, & van der Laan, 2018;Kottelat,2013); Pachypterus particular. atherinoides (Bloch, 1794) distributed in river drainages of the Indian subcontinent north of the Cauvery, Bangladesh, Methods Nepal, and Pakistan (Ahamed et al., 2018; Buragohain, Study area, fish collection, and measurements 2018; Eschmeyer et al., 2018); and Pachypterus khavalchor Monthly samples were collected during June 2015 to (Kulkarni, 1952) which inhabits the Krishna River basin of May 2016 with the help of
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